1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2002-2005 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com> 4 5 This file is part of libunwind. 6 7 Permission is hereby granted, free of charge, to any person obtaining 8 a copy of this software and associated documentation files (the 9 "Software"), to deal in the Software without restriction, including 10 without limitation the rights to use, copy, modify, merge, publish, 11 distribute, sublicense, and/or sell copies of the Software, and to 12 permit persons to whom the Software is furnished to do so, subject to 13 the following conditions: 14 15 The above copyright notice and this permission notice shall be 16 included in all copies or substantial portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26 #ifndef X86_LIBUNWIND_I_H 27 #define X86_LIBUNWIND_I_H 28 29 /* Target-dependent definitions that are internal to libunwind but need 30 to be shared with target-independent code. */ 31 32 #include <stdlib.h> 33 #include <libunwind.h> 34 35 #include "elf32.h" 36 /* ANDROID support update. */ 37 #include "map_info.h" 38 /* End of ANDROID update. */ 39 #include "mempool.h" 40 #include "dwarf.h" 41 42 typedef struct 43 { 44 /* no x86-specific fast trace */ 45 } 46 unw_tdep_frame_t; 47 48 struct unw_addr_space 49 { 50 struct unw_accessors acc; 51 unw_caching_policy_t caching_policy; 52 #ifdef HAVE_ATOMIC_OPS_H 53 AO_t cache_generation; 54 #else 55 uint32_t cache_generation; 56 #endif 57 unw_word_t dyn_generation; /* see dyn-common.h */ 58 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */ 59 struct dwarf_rs_cache global_cache; 60 struct unw_debug_frame_list *debug_frames; 61 /* ANDROID support update. */ 62 #if defined(__linux__) 63 struct map_info *map_list; 64 #endif 65 /* End of ANDROID update. */ 66 }; 67 68 struct cursor 69 { 70 struct dwarf_cursor dwarf; /* must be first */ 71 72 /* Format of sigcontext structure and address at which it is 73 stored: */ 74 enum 75 { 76 X86_SCF_NONE, /* no signal frame encountered */ 77 X86_SCF_LINUX_SIGFRAME, /* Linux x86 sigcontext */ 78 X86_SCF_LINUX_RT_SIGFRAME, /* POSIX ucontext_t */ 79 X86_SCF_FREEBSD_SIGFRAME, /* FreeBSD x86 sigcontext */ 80 X86_SCF_FREEBSD_SIGFRAME4, /* FreeBSD 4.x x86 sigcontext */ 81 X86_SCF_FREEBSD_OSIGFRAME, /* FreeBSD pre-4.x x86 sigcontext */ 82 X86_SCF_FREEBSD_SYSCALL, /* FreeBSD x86 syscall */ 83 } 84 sigcontext_format; 85 unw_word_t sigcontext_addr; 86 int validate; 87 ucontext_t *uc; 88 }; 89 90 static inline ucontext_t * 91 dwarf_get_uc(const struct dwarf_cursor *cursor) 92 { 93 const struct cursor *c = (struct cursor *) cursor->as_arg; 94 return c->uc; 95 } 96 97 #define DWARF_GET_LOC(l) ((l).val) 98 99 #ifdef UNW_LOCAL_ONLY 100 # define DWARF_NULL_LOC DWARF_LOC (0, 0) 101 # define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0) 102 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) }) 103 # define DWARF_IS_REG_LOC(l) 0 104 # define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) \ 105 tdep_uc_addr(dwarf_get_uc(c), (r)), 0)) 106 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0) 107 # define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) \ 108 tdep_uc_addr(dwarf_get_uc(c), (r)), 0)) 109 110 static inline int 111 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val) 112 { 113 if (!DWARF_GET_LOC (loc)) 114 return -1; 115 *val = *(unw_fpreg_t *) DWARF_GET_LOC (loc); 116 return 0; 117 } 118 119 static inline int 120 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val) 121 { 122 if (!DWARF_GET_LOC (loc)) 123 return -1; 124 *(unw_fpreg_t *) DWARF_GET_LOC (loc) = val; 125 return 0; 126 } 127 128 static inline int 129 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val) 130 { 131 if (!DWARF_GET_LOC (loc)) 132 return -1; 133 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val, 134 0, c->as_arg); 135 } 136 137 static inline int 138 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val) 139 { 140 if (!DWARF_GET_LOC (loc)) 141 return -1; 142 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val, 143 1, c->as_arg); 144 } 145 146 #else /* !UNW_LOCAL_ONLY */ 147 # define DWARF_LOC_TYPE_FP (1 << 0) 148 # define DWARF_LOC_TYPE_REG (1 << 1) 149 # define DWARF_NULL_LOC DWARF_LOC (0, 0) 150 # define DWARF_IS_NULL_LOC(l) \ 151 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; }) 152 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) }) 153 # define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0) 154 # define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0) 155 # define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG) 156 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0) 157 # define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \ 158 | DWARF_LOC_TYPE_FP)) 159 160 static inline int 161 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val) 162 { 163 char *valp = (char *) &val; 164 unw_word_t addr; 165 int ret; 166 167 if (DWARF_IS_NULL_LOC (loc)) 168 return -UNW_EBADREG; 169 170 if (DWARF_IS_REG_LOC (loc)) 171 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc), 172 val, 0, c->as_arg); 173 174 addr = DWARF_GET_LOC (loc); 175 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp, 176 0, c->as_arg)) < 0) 177 return ret; 178 179 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0, 180 c->as_arg); 181 } 182 183 static inline int 184 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val) 185 { 186 char *valp = (char *) &val; 187 unw_word_t addr; 188 int ret; 189 190 if (DWARF_IS_NULL_LOC (loc)) 191 return -UNW_EBADREG; 192 193 if (DWARF_IS_REG_LOC (loc)) 194 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc), 195 &val, 1, c->as_arg); 196 197 addr = DWARF_GET_LOC (loc); 198 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp, 199 1, c->as_arg)) < 0) 200 return ret; 201 202 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 203 1, c->as_arg); 204 } 205 206 static inline int 207 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val) 208 { 209 if (DWARF_IS_NULL_LOC (loc)) 210 return -UNW_EBADREG; 211 212 /* If a code-generator were to save a value of type unw_word_t in a 213 floating-point register, we would have to support this case. I 214 suppose it could happen with MMX registers, but does it really 215 happen? */ 216 assert (!DWARF_IS_FP_LOC (loc)); 217 218 if (DWARF_IS_REG_LOC (loc)) 219 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val, 220 0, c->as_arg); 221 else 222 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val, 223 0, c->as_arg); 224 } 225 226 static inline int 227 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val) 228 { 229 if (DWARF_IS_NULL_LOC (loc)) 230 return -UNW_EBADREG; 231 232 /* If a code-generator were to save a value of type unw_word_t in a 233 floating-point register, we would have to support this case. I 234 suppose it could happen with MMX registers, but does it really 235 happen? */ 236 assert (!DWARF_IS_FP_LOC (loc)); 237 238 if (DWARF_IS_REG_LOC (loc)) 239 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val, 240 1, c->as_arg); 241 else 242 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val, 243 1, c->as_arg); 244 } 245 246 #endif /* !UNW_LOCAL_ONLY */ 247 248 #define tdep_getcontext_trace unw_getcontext 249 #define tdep_init_done UNW_OBJ(init_done) 250 #define tdep_init UNW_OBJ(init) 251 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define 252 tdep_search_unwind_table. */ 253 #define tdep_search_unwind_table dwarf_search_unwind_table 254 #define tdep_find_unwind_table dwarf_find_unwind_table 255 #define tdep_uc_addr UNW_ARCH_OBJ(uc_addr) 256 #define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image) 257 #define tdep_access_reg UNW_OBJ(access_reg) 258 #define tdep_access_fpreg UNW_OBJ(access_fpreg) 259 #define tdep_fetch_frame(c,ip,n) do {} while(0) 260 #define tdep_cache_frame(c,rs) do {} while(0) 261 #define tdep_reuse_frame(c,rs) do {} while(0) 262 #define tdep_stash_frame(c,rs) do {} while(0) 263 #define tdep_trace(cur,addr,n) (-UNW_ENOINFO) 264 265 #ifdef UNW_LOCAL_ONLY 266 # define tdep_find_proc_info(c,ip,n) \ 267 dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n), \ 268 (c)->as_arg) 269 # define tdep_put_unwind_info(as,pi,arg) \ 270 dwarf_put_unwind_info((as), (pi), (arg)) 271 #else 272 # define tdep_find_proc_info(c,ip,n) \ 273 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \ 274 (c)->as_arg) 275 # define tdep_put_unwind_info(as,pi,arg) \ 276 (*(as)->acc.put_unwind_info)((as), (pi), (arg)) 277 #endif 278 279 #define tdep_get_as(c) ((c)->dwarf.as) 280 #define tdep_get_as_arg(c) ((c)->dwarf.as_arg) 281 #define tdep_get_ip(c) ((c)->dwarf.ip) 282 #define tdep_big_endian(as) 0 283 284 extern int tdep_init_done; 285 286 extern void tdep_init (void); 287 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip, 288 unw_dyn_info_t *di, unw_proc_info_t *pi, 289 int need_unwind_info, void *arg); 290 extern void *tdep_uc_addr (ucontext_t *uc, int reg); 291 /* ANDROID support update. */ 292 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei, 293 pid_t pid, unw_word_t ip, 294 unsigned long *segbase, unsigned long *mapoff, 295 char **path); 296 /* End of ANDROID update. */ 297 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg, 298 unw_word_t *valp, int write); 299 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, 300 unw_fpreg_t *valp, int write); 301 302 #endif /* X86_LIBUNWIND_I_H */ 303
